1 /* 2 * Copyright (c) 2003, 2004 Matthew Dillon. All rights reserved. 3 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved. 4 * Copyright (c) 2003 Jonathan Lemon. All rights reserved. 5 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved. 6 * 7 * This code is derived from software contributed to The DragonFly Project 8 * by Jonathan Lemon, Jeffrey M. Hsu, and Matthew Dillon. 9 * 10 * Jonathan Lemon gave Jeffrey Hsu permission to combine his copyright 11 * into this one around July 8 2004. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of The DragonFly Project nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific, prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 28 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 29 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 30 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 31 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 32 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 33 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 34 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 35 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/malloc.h> 43 #include <sys/msgport.h> 44 #include <sys/proc.h> 45 #include <sys/interrupt.h> 46 #include <sys/socket.h> 47 #include <sys/sysctl.h> 48 #include <sys/socketvar.h> 49 #include <net/if.h> 50 #include <net/if_var.h> 51 #include <net/netisr2.h> 52 #include <machine/cpufunc.h> 53 #include <machine/smp.h> 54 55 #include <sys/thread2.h> 56 #include <sys/msgport2.h> 57 #include <net/netmsg2.h> 58 #include <sys/mplock2.h> 59 60 static void netmsg_service_loop(void *arg); 61 static void netisr_hashfn0(struct mbuf **mp, int hoff); 62 static void netisr_nohashck(struct mbuf *, const struct pktinfo *); 63 64 struct netmsg_port_registration { 65 TAILQ_ENTRY(netmsg_port_registration) npr_entry; 66 lwkt_port_t npr_port; 67 }; 68 69 struct netmsg_rollup { 70 TAILQ_ENTRY(netmsg_rollup) ru_entry; 71 netisr_ru_t ru_func; 72 int ru_prio; 73 }; 74 75 struct netmsg_barrier { 76 struct netmsg_base base; 77 volatile cpumask_t *br_cpumask; 78 volatile uint32_t br_done; 79 }; 80 81 #define NETISR_BR_NOTDONE 0x1 82 #define NETISR_BR_WAITDONE 0x80000000 83 84 struct netisr_barrier { 85 struct netmsg_barrier *br_msgs[MAXCPU]; 86 int br_isset; 87 }; 88 89 static struct netisr netisrs[NETISR_MAX]; 90 static TAILQ_HEAD(,netmsg_port_registration) netreglist; 91 static TAILQ_HEAD(,netmsg_rollup) netrulist; 92 93 /* Per-CPU thread to handle any protocol. */ 94 struct thread netisr_cpu[MAXCPU]; 95 lwkt_port netisr_afree_rport; 96 lwkt_port netisr_afree_free_so_rport; 97 lwkt_port netisr_adone_rport; 98 lwkt_port netisr_apanic_rport; 99 lwkt_port netisr_sync_port; 100 101 static int (*netmsg_fwd_port_fn)(lwkt_port_t, lwkt_msg_t); 102 103 SYSCTL_NODE(_net, OID_AUTO, netisr, CTLFLAG_RW, 0, "netisr"); 104 105 /* 106 * netisr_afree_rport replymsg function, only used to handle async 107 * messages which the sender has abandoned to their fate. 108 */ 109 static void 110 netisr_autofree_reply(lwkt_port_t port, lwkt_msg_t msg) 111 { 112 kfree(msg, M_LWKTMSG); 113 } 114 115 static void 116 netisr_autofree_free_so_reply(lwkt_port_t port, lwkt_msg_t msg) 117 { 118 sofree(((netmsg_t)msg)->base.nm_so); 119 kfree(msg, M_LWKTMSG); 120 } 121 122 /* 123 * We need a custom putport function to handle the case where the 124 * message target is the current thread's message port. This case 125 * can occur when the TCP or UDP stack does a direct callback to NFS and NFS 126 * then turns around and executes a network operation synchronously. 127 * 128 * To prevent deadlocking, we must execute these self-referential messages 129 * synchronously, effectively turning the message into a glorified direct 130 * procedure call back into the protocol stack. The operation must be 131 * complete on return or we will deadlock, so panic if it isn't. 132 * 133 * However, the target function is under no obligation to immediately 134 * reply the message. It may forward it elsewhere. 135 */ 136 static int 137 netmsg_put_port(lwkt_port_t port, lwkt_msg_t lmsg) 138 { 139 netmsg_base_t nmsg = (void *)lmsg; 140 141 if ((lmsg->ms_flags & MSGF_SYNC) && port == &curthread->td_msgport) { 142 nmsg->nm_dispatch((netmsg_t)nmsg); 143 return(EASYNC); 144 } else { 145 return(netmsg_fwd_port_fn(port, lmsg)); 146 } 147 } 148 149 /* 150 * UNIX DOMAIN sockets still have to run their uipc functions synchronously, 151 * because they depend on the user proc context for a number of things 152 * (like creds) which we have not yet incorporated into the message structure. 153 * 154 * However, we maintain or message/port abstraction. Having a special 155 * synchronous port which runs the commands synchronously gives us the 156 * ability to serialize operations in one place later on when we start 157 * removing the BGL. 158 */ 159 static int 160 netmsg_sync_putport(lwkt_port_t port, lwkt_msg_t lmsg) 161 { 162 netmsg_base_t nmsg = (void *)lmsg; 163 164 KKASSERT((lmsg->ms_flags & MSGF_DONE) == 0); 165 166 lmsg->ms_target_port = port; /* required for abort */ 167 nmsg->nm_dispatch((netmsg_t)nmsg); 168 return(EASYNC); 169 } 170 171 static void 172 netisr_init(void) 173 { 174 int i; 175 176 TAILQ_INIT(&netreglist); 177 TAILQ_INIT(&netrulist); 178 179 /* 180 * Create default per-cpu threads for generic protocol handling. 181 */ 182 for (i = 0; i < ncpus; ++i) { 183 lwkt_create(netmsg_service_loop, NULL, NULL, 184 &netisr_cpu[i], TDF_NOSTART|TDF_FORCE_SPINPORT, 185 i, "netisr_cpu %d", i); 186 netmsg_service_port_init(&netisr_cpu[i].td_msgport); 187 lwkt_schedule(&netisr_cpu[i]); 188 } 189 190 /* 191 * The netisr_afree_rport is a special reply port which automatically 192 * frees the replied message. The netisr_adone_rport simply marks 193 * the message as being done. The netisr_apanic_rport panics if 194 * the message is replied to. 195 */ 196 lwkt_initport_replyonly(&netisr_afree_rport, netisr_autofree_reply); 197 lwkt_initport_replyonly(&netisr_afree_free_so_rport, 198 netisr_autofree_free_so_reply); 199 lwkt_initport_replyonly_null(&netisr_adone_rport); 200 lwkt_initport_panic(&netisr_apanic_rport); 201 202 /* 203 * The netisr_syncport is a special port which executes the message 204 * synchronously and waits for it if EASYNC is returned. 205 */ 206 lwkt_initport_putonly(&netisr_sync_port, netmsg_sync_putport); 207 } 208 209 SYSINIT(netisr, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, netisr_init, NULL); 210 211 /* 212 * Finish initializing the message port for a netmsg service. This also 213 * registers the port for synchronous cleanup operations such as when an 214 * ifnet is being destroyed. There is no deregistration API yet. 215 */ 216 void 217 netmsg_service_port_init(lwkt_port_t port) 218 { 219 struct netmsg_port_registration *reg; 220 221 /* 222 * Override the putport function. Our custom function checks for 223 * self-references and executes such commands synchronously. 224 */ 225 if (netmsg_fwd_port_fn == NULL) 226 netmsg_fwd_port_fn = port->mp_putport; 227 KKASSERT(netmsg_fwd_port_fn == port->mp_putport); 228 port->mp_putport = netmsg_put_port; 229 230 /* 231 * Keep track of ports using the netmsg API so we can synchronize 232 * certain operations (such as freeing an ifnet structure) across all 233 * consumers. 234 */ 235 reg = kmalloc(sizeof(*reg), M_TEMP, M_WAITOK|M_ZERO); 236 reg->npr_port = port; 237 TAILQ_INSERT_TAIL(&netreglist, reg, npr_entry); 238 } 239 240 /* 241 * This function synchronizes the caller with all netmsg services. For 242 * example, if an interface is being removed we must make sure that all 243 * packets related to that interface complete processing before the structure 244 * can actually be freed. This sort of synchronization is an alternative to 245 * ref-counting the netif, removing the ref counting overhead in favor of 246 * placing additional overhead in the netif freeing sequence (where it is 247 * inconsequential). 248 */ 249 void 250 netmsg_service_sync(void) 251 { 252 struct netmsg_port_registration *reg; 253 struct netmsg_base smsg; 254 255 netmsg_init(&smsg, NULL, &curthread->td_msgport, 0, netmsg_sync_handler); 256 257 TAILQ_FOREACH(reg, &netreglist, npr_entry) { 258 lwkt_domsg(reg->npr_port, &smsg.lmsg, 0); 259 } 260 } 261 262 /* 263 * The netmsg function simply replies the message. API semantics require 264 * EASYNC to be returned if the netmsg function disposes of the message. 265 */ 266 void 267 netmsg_sync_handler(netmsg_t msg) 268 { 269 lwkt_replymsg(&msg->lmsg, 0); 270 } 271 272 /* 273 * Generic netmsg service loop. Some protocols may roll their own but all 274 * must do the basic command dispatch function call done here. 275 */ 276 static void 277 netmsg_service_loop(void *arg) 278 { 279 struct netmsg_rollup *ru; 280 netmsg_base_t msg; 281 thread_t td = curthread; 282 int limit; 283 284 td->td_type = TD_TYPE_NETISR; 285 286 while ((msg = lwkt_waitport(&td->td_msgport, 0))) { 287 /* 288 * Run up to 512 pending netmsgs. 289 */ 290 limit = 512; 291 do { 292 KASSERT(msg->nm_dispatch != NULL, 293 ("netmsg_service isr %d badmsg", 294 msg->lmsg.u.ms_result)); 295 if (msg->nm_so && 296 msg->nm_so->so_port != &td->td_msgport) { 297 /* 298 * Sockets undergoing connect or disconnect 299 * ops can change ports on us. Chase the 300 * port. 301 */ 302 kprintf("netmsg_service_loop: Warning, " 303 "port changed so=%p\n", msg->nm_so); 304 lwkt_forwardmsg(msg->nm_so->so_port, 305 &msg->lmsg); 306 } else { 307 /* 308 * We are on the correct port, dispatch it. 309 */ 310 msg->nm_dispatch((netmsg_t)msg); 311 } 312 if (--limit == 0) 313 break; 314 } while ((msg = lwkt_getport(&td->td_msgport)) != NULL); 315 316 /* 317 * Run all registered rollup functions for this cpu 318 * (e.g. tcp_willblock()). 319 */ 320 TAILQ_FOREACH(ru, &netrulist, ru_entry) 321 ru->ru_func(); 322 } 323 } 324 325 /* 326 * Forward a packet to a netisr service function. 327 * 328 * If the packet has not been assigned to a protocol thread we call 329 * the port characterization function to assign it. The caller must 330 * clear M_HASH (or not have set it in the first place) if the caller 331 * wishes the packet to be recharacterized. 332 */ 333 int 334 netisr_queue(int num, struct mbuf *m) 335 { 336 struct netisr *ni; 337 struct netmsg_packet *pmsg; 338 lwkt_port_t port; 339 340 KASSERT((num > 0 && num <= NELEM(netisrs)), 341 ("Bad isr %d", num)); 342 343 ni = &netisrs[num]; 344 if (ni->ni_handler == NULL) { 345 kprintf("Unregistered isr %d\n", num); 346 m_freem(m); 347 return (EIO); 348 } 349 350 /* 351 * Figure out which protocol thread to send to. This does not 352 * have to be perfect but performance will be really good if it 353 * is correct. Major protocol inputs such as ip_input() will 354 * re-characterize the packet as necessary. 355 */ 356 if ((m->m_flags & M_HASH) == 0) { 357 ni->ni_hashfn(&m, 0); 358 if (m == NULL) { 359 m_freem(m); 360 return (EIO); 361 } 362 if ((m->m_flags & M_HASH) == 0) { 363 kprintf("netisr_queue(%d): packet hash failed\n", num); 364 m_freem(m); 365 return (EIO); 366 } 367 } 368 369 /* 370 * Get the protocol port based on the packet hash, initialize 371 * the netmsg, and send it off. 372 */ 373 port = netisr_hashport(m->m_pkthdr.hash); 374 pmsg = &m->m_hdr.mh_netmsg; 375 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 376 0, ni->ni_handler); 377 pmsg->nm_packet = m; 378 pmsg->base.lmsg.u.ms_result = num; 379 lwkt_sendmsg(port, &pmsg->base.lmsg); 380 381 return (0); 382 } 383 384 /* 385 * Run a netisr service function on the packet. 386 * 387 * The packet must have been correctly characterized! 388 */ 389 int 390 netisr_handle(int num, struct mbuf *m) 391 { 392 struct netisr *ni; 393 struct netmsg_packet *pmsg; 394 lwkt_port_t port; 395 396 /* 397 * Get the protocol port based on the packet hash 398 */ 399 KASSERT((m->m_flags & M_HASH), ("packet not characterized")); 400 port = netisr_hashport(m->m_pkthdr.hash); 401 KASSERT(&curthread->td_msgport == port, ("wrong msgport")); 402 403 KASSERT((num > 0 && num <= NELEM(netisrs)), ("bad isr %d", num)); 404 ni = &netisrs[num]; 405 if (ni->ni_handler == NULL) { 406 kprintf("unregistered isr %d\n", num); 407 m_freem(m); 408 return EIO; 409 } 410 411 /* 412 * Initialize the netmsg, and run the handler directly. 413 */ 414 pmsg = &m->m_hdr.mh_netmsg; 415 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 416 0, ni->ni_handler); 417 pmsg->nm_packet = m; 418 pmsg->base.lmsg.u.ms_result = num; 419 ni->ni_handler((netmsg_t)&pmsg->base); 420 421 return 0; 422 } 423 424 /* 425 * Pre-characterization of a deeper portion of the packet for the 426 * requested isr. 427 * 428 * The base of the ISR type (e.g. IP) that we want to characterize is 429 * at (hoff) relative to the beginning of the mbuf. This allows 430 * e.g. ether_characterize() to not have to adjust the m_data/m_len. 431 */ 432 void 433 netisr_characterize(int num, struct mbuf **mp, int hoff) 434 { 435 struct netisr *ni; 436 struct mbuf *m; 437 438 /* 439 * Validation 440 */ 441 m = *mp; 442 KKASSERT(m != NULL); 443 444 if (num < 0 || num >= NETISR_MAX) { 445 if (num == NETISR_MAX) { 446 m->m_flags |= M_HASH; 447 m->m_pkthdr.hash = 0; 448 return; 449 } 450 panic("Bad isr %d", num); 451 } 452 453 /* 454 * Valid netisr? 455 */ 456 ni = &netisrs[num]; 457 if (ni->ni_handler == NULL) { 458 kprintf("Unregistered isr %d\n", num); 459 m_freem(m); 460 *mp = NULL; 461 } 462 463 /* 464 * Characterize the packet 465 */ 466 if ((m->m_flags & M_HASH) == 0) { 467 ni->ni_hashfn(mp, hoff); 468 m = *mp; 469 if (m && (m->m_flags & M_HASH) == 0) 470 kprintf("netisr_queue(%d): packet hash failed\n", num); 471 } 472 } 473 474 void 475 netisr_register(int num, netisr_fn_t handler, netisr_hashfn_t hashfn) 476 { 477 struct netisr *ni; 478 479 KASSERT((num > 0 && num <= NELEM(netisrs)), 480 ("netisr_register: bad isr %d", num)); 481 KKASSERT(handler != NULL); 482 483 if (hashfn == NULL) 484 hashfn = netisr_hashfn0; 485 486 ni = &netisrs[num]; 487 488 ni->ni_handler = handler; 489 ni->ni_hashck = netisr_nohashck; 490 ni->ni_hashfn = hashfn; 491 netmsg_init(&ni->ni_netmsg, NULL, &netisr_adone_rport, 0, NULL); 492 } 493 494 void 495 netisr_register_hashcheck(int num, netisr_hashck_t hashck) 496 { 497 struct netisr *ni; 498 499 KASSERT((num > 0 && num <= NELEM(netisrs)), 500 ("netisr_register: bad isr %d", num)); 501 502 ni = &netisrs[num]; 503 ni->ni_hashck = hashck; 504 } 505 506 void 507 netisr_register_rollup(netisr_ru_t ru_func, int prio) 508 { 509 struct netmsg_rollup *new_ru, *ru; 510 511 new_ru = kmalloc(sizeof(*new_ru), M_TEMP, M_WAITOK|M_ZERO); 512 new_ru->ru_func = ru_func; 513 new_ru->ru_prio = prio; 514 515 /* 516 * Higher priority "rollup" appears first 517 */ 518 TAILQ_FOREACH(ru, &netrulist, ru_entry) { 519 if (ru->ru_prio < new_ru->ru_prio) { 520 TAILQ_INSERT_BEFORE(ru, new_ru, ru_entry); 521 return; 522 } 523 } 524 TAILQ_INSERT_TAIL(&netrulist, new_ru, ru_entry); 525 } 526 527 /* 528 * Return a default protocol control message processing thread port 529 */ 530 lwkt_port_t 531 cpu0_ctlport(int cmd __unused, struct sockaddr *sa __unused, 532 void *extra __unused) 533 { 534 return (&netisr_cpu[0].td_msgport); 535 } 536 537 /* 538 * This is a default netisr packet characterization function which 539 * sets M_HASH. If a netisr is registered with a NULL hashfn function 540 * this one is assigned. 541 * 542 * This function makes no attempt to validate the packet. 543 */ 544 static void 545 netisr_hashfn0(struct mbuf **mp, int hoff __unused) 546 { 547 struct mbuf *m = *mp; 548 549 m->m_flags |= M_HASH; 550 m->m_pkthdr.hash = 0; 551 } 552 553 /* 554 * schednetisr() is used to call the netisr handler from the appropriate 555 * netisr thread for polling and other purposes. 556 * 557 * This function may be called from a hard interrupt or IPI and must be 558 * MP SAFE and non-blocking. We use a fixed per-cpu message instead of 559 * trying to allocate one. We must get ourselves onto the target cpu 560 * to safely check the MSGF_DONE bit on the message but since the message 561 * will be sent to that cpu anyway this does not add any extra work beyond 562 * what lwkt_sendmsg() would have already had to do to schedule the target 563 * thread. 564 */ 565 static void 566 schednetisr_remote(void *data) 567 { 568 int num = (int)(intptr_t)data; 569 struct netisr *ni = &netisrs[num]; 570 lwkt_port_t port = &netisr_cpu[0].td_msgport; 571 netmsg_base_t pmsg; 572 573 pmsg = &netisrs[num].ni_netmsg; 574 if (pmsg->lmsg.ms_flags & MSGF_DONE) { 575 netmsg_init(pmsg, NULL, &netisr_adone_rport, 0, ni->ni_handler); 576 pmsg->lmsg.u.ms_result = num; 577 lwkt_sendmsg(port, &pmsg->lmsg); 578 } 579 } 580 581 void 582 schednetisr(int num) 583 { 584 KASSERT((num > 0 && num <= NELEM(netisrs)), 585 ("schednetisr: bad isr %d", num)); 586 KKASSERT(netisrs[num].ni_handler != NULL); 587 if (mycpu->gd_cpuid != 0) { 588 lwkt_send_ipiq(globaldata_find(0), 589 schednetisr_remote, (void *)(intptr_t)num); 590 } else { 591 crit_enter(); 592 schednetisr_remote((void *)(intptr_t)num); 593 crit_exit(); 594 } 595 } 596 597 static void 598 netisr_barrier_dispatch(netmsg_t nmsg) 599 { 600 struct netmsg_barrier *msg = (struct netmsg_barrier *)nmsg; 601 602 atomic_clear_cpumask(msg->br_cpumask, mycpu->gd_cpumask); 603 if (*msg->br_cpumask == 0) 604 wakeup(msg->br_cpumask); 605 606 for (;;) { 607 uint32_t done = msg->br_done; 608 609 cpu_ccfence(); 610 if ((done & NETISR_BR_NOTDONE) == 0) 611 break; 612 613 tsleep_interlock(&msg->br_done, 0); 614 if (atomic_cmpset_int(&msg->br_done, 615 done, done | NETISR_BR_WAITDONE)) 616 tsleep(&msg->br_done, PINTERLOCKED, "nbrdsp", 0); 617 } 618 619 lwkt_replymsg(&nmsg->lmsg, 0); 620 } 621 622 struct netisr_barrier * 623 netisr_barrier_create(void) 624 { 625 struct netisr_barrier *br; 626 627 br = kmalloc(sizeof(*br), M_LWKTMSG, M_WAITOK | M_ZERO); 628 return br; 629 } 630 631 void 632 netisr_barrier_set(struct netisr_barrier *br) 633 { 634 volatile cpumask_t other_cpumask; 635 int i, cur_cpuid; 636 637 KKASSERT(&curthread->td_msgport == netisr_cpuport(0)); 638 KKASSERT(!br->br_isset); 639 640 other_cpumask = mycpu->gd_other_cpus & smp_active_mask; 641 cur_cpuid = mycpuid; 642 643 for (i = 0; i < ncpus; ++i) { 644 struct netmsg_barrier *msg; 645 646 if (i == cur_cpuid) 647 continue; 648 649 msg = kmalloc(sizeof(struct netmsg_barrier), 650 M_LWKTMSG, M_WAITOK); 651 netmsg_init(&msg->base, NULL, &netisr_afree_rport, 652 MSGF_PRIORITY, netisr_barrier_dispatch); 653 msg->br_cpumask = &other_cpumask; 654 msg->br_done = NETISR_BR_NOTDONE; 655 656 KKASSERT(br->br_msgs[i] == NULL); 657 br->br_msgs[i] = msg; 658 } 659 660 for (i = 0; i < ncpus; ++i) { 661 if (i == cur_cpuid) 662 continue; 663 lwkt_sendmsg(netisr_cpuport(i), &br->br_msgs[i]->base.lmsg); 664 } 665 666 while (other_cpumask != 0) { 667 tsleep_interlock(&other_cpumask, 0); 668 if (other_cpumask != 0) 669 tsleep(&other_cpumask, PINTERLOCKED, "nbrset", 0); 670 } 671 br->br_isset = 1; 672 } 673 674 void 675 netisr_barrier_rem(struct netisr_barrier *br) 676 { 677 int i, cur_cpuid; 678 679 KKASSERT(&curthread->td_msgport == netisr_cpuport(0)); 680 KKASSERT(br->br_isset); 681 682 cur_cpuid = mycpuid; 683 for (i = 0; i < ncpus; ++i) { 684 struct netmsg_barrier *msg = br->br_msgs[i]; 685 uint32_t done; 686 687 msg = br->br_msgs[i]; 688 br->br_msgs[i] = NULL; 689 690 if (i == cur_cpuid) 691 continue; 692 693 done = atomic_swap_int(&msg->br_done, 0); 694 if (done & NETISR_BR_WAITDONE) 695 wakeup(&msg->br_done); 696 } 697 br->br_isset = 0; 698 } 699 700 static void 701 netisr_nohashck(struct mbuf *m, const struct pktinfo *pi __unused) 702 { 703 m->m_flags &= ~M_HASH; 704 } 705 706 void 707 netisr_hashcheck(int num, struct mbuf *m, const struct pktinfo *pi) 708 { 709 struct netisr *ni; 710 711 if (num < 0 || num >= NETISR_MAX) 712 panic("Bad isr %d", num); 713 714 /* 715 * Valid netisr? 716 */ 717 ni = &netisrs[num]; 718 if (ni->ni_handler == NULL) 719 panic("Unregistered isr %d", num); 720 721 ni->ni_hashck(m, pi); 722 } 723